The impact of international patent systems: Evidence from accession to the European Patent Convention *

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1 The impact of international patent systems: Evidence from accession to the European Patent Convention * Bronwyn Hall 1 Christian Helmers 2 February 2016 Incomplete please do not cite or circulate Abstract: We analyze the impact of accession to the regional patent system established by the European Patent Convention (EPC) on 14 countries that acceded between 2000 and We look at changes in patenting behavior by domestic and foreign applicants at the national patent offices, and the European Patent Office (EPO). Our findings suggest a strong change in patent filing behavior among foreigners seeking patent protection in the accession states, substituting domestic patents with EPO patents, mostly in chemicals and pharmaceuticals. At the same time, there is no discernible reaction among domestic entities in terms of domestic filings. Yet, we find some evidence at the firm-level that manufacturing companies in accession states increased their propensity to file patents with the EPO post-accession. Key words: European Patent Convention, accession, patents JEL code: F53, O34 * We gratefully acknowledge financial support from the European Patent Office (EPO) and comments from Nikolaus Thumm. The views expressed here are those of the authors. They are not necessarily those of the European Patent Office. The paper was presented at the 12 th Annual Intellectual Property Scholars Conference at Stanford in 2012, the 7 th Annual EPIP Conference in Leuven in 2012, and the JRC-IPTS in Sevilla in University of California at Berkeley, NBER, IFS, and NIESR; bhhall@berkeley.edu 2 Santa Clara University; chelmers@scu.edu 1

2 1. Introduction There is a long-standing debate on the impact of intellectual property rights on innovation and economic development. 3 One of the most controversial questions revolves around the strength of patent protection in lower- and middle-income economies. Underlying this debate is the fact that countries have the ability to individually determine important aspects of their intellectual property (IP) rights systems. Although there are international agreements such as the Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS) which harmonize and regulate important aspects of national IP systems, 4 there is no international patent system. 5 This often overlooked fact means that patents are national rights and thus valid only in the jurisdiction that grants them. This in turn implies that regardless of the strength of statutory patent protection, the same invention may be patent-protected in one jurisdiction but not in another. Hence, apart from the availability and strength of patent protection, the need to file patents on the same invention in each country in which patent protection is sought is likely to affect companies decisions where to obtain patent protection and therefore their business decisions including R&D, investment, exporting etc. It is also likely to affect business decisions of companies other than the patentees, especially those in lower- and middle-income economies. Although there is an extensive literature on the effect of differences in patent protection across countries as well as within countries over time, there is a striking lack of evidence on the effect of the national character of patent rights. Even if statutory patent protection were the same across countries, the fact that separate patents have to be obtained in each jurisdiction in which patent protection is sought has received scant attention in the literature. We use data for a set of 14 countries that joined the European Patent Convention (EPC) to explore the impact of the accession on patenting behavior by firms in those countries. 6 The EPC is a regional patent system that provides uniform patent protection in all member and extension states that co-exists with national patent systems. It offers a single route to obtaining a patent grant in all member and extension states. Accession to the EPC, therefore, offers an interesting setting to study the effect of the introduction of an international patent system. The period that we study, , is particularly interesting because a number of relatively less developed transition and emerging market economies joined the EPC regional patent system which had been mainly composed of more advanced EU countries. 7 3 There is an extensive literature on the issue, see for example Nordhaus (1969), Diwan and Rodrik (1991), Helpman (1993), Gould and Gruben (1996), and Lerner (2002). 4 Although TRIPS regulates important aspects of national IP systems (for example, signatories have to grant patent protection on both product and process innovation), there remains considerable discretion (for example, signatories can define patent eligible subject matter). 5 There is the Patent Cooperation Treaty (PCT) administered by the World Intellectual Property Organization (WIPO). The PCT offers only a simplified patent filing system for an applicant to obtain patent protection in several countries worldwide through a single application. While the application is filed with WIPO, the decision of whether the patent will be granted remains with the national patent authorities. Hence, despite a single patent filing, there is still the need to prosecute the patent filing separately in each jurisdiction to obtain a patent grant. 6 The countries are: Bulgaria, Czech Republic, Estonia, Croatia, Hungary, Iceland, Lithuania, Latvia, Norway, Poland, Romania, Slovenia, Slovakia, and Turkey. See Appendix Table A GDP per capita averaged US$33,800 in those countries that joined before 2000, whereas it averaged US$18,600 in those 14 countries that joined between 2000 and

3 Joining the EPC potentially has two main effects. First, it becomes cheaper for residents to simultaneously obtain patent protection both domestically and in the other countries signatory to the EPC. Second, it also becomes cheaper for foreigners to obtain patent protection in the country as they can obtain an EPC patent in the country instead of filing a separate patent application with the national office of the country. This implies that on the one hand, it becomes cheaper for domestic firms to obtain simultaneously patent protection at home and abroad, and on the other, it becomes cheaper for foreign firms to obtain patent protection in the country provided they obtain patent protection in another country signatory to the EPC. 8 Our analysis offers two main insights. First, we find hardly any response by domestic entities. There is neither an uptake in EPO filings nor a significant drop in patent filings with the national office. Second, foreign entities react strongly to accession to the EPO. We see both an increase in the number of filings by foreign entities in form of EPO patents post-accession as well as new patentees that had previously not patented in that country. Our analysis contributes to the literature by providing evidence on the effect of the national character of patents as well as the introduction of an international patent system. Because most accession states were lower/middle income economies, our results also provide some insight into the impact of such international patent systems on developing countries in the rest of the world. From a policy point of view, our analysis may in particular provide lessons for developing countries that consider joining the PCT system. By facilitating the filing of patents in several jurisdictions, joining the PCT system generates similar effects to joining the EPC system. It may also inform us about the potential impact of the European patent with unitary effect in 25 countries (that are part of the enhanced cooperation agreement) which will become available in Under the agreement, validation of the European unitary patent in a national office is no longer required for the patent to enter into force. Our results suggest that this will lead to a sudden and persistent increase in the number of valid European patents in countries that so far recorded few validations of EPO patents. Given the expected costs savings in obtaining patent protection across several European countries due to the unitary patent, the effect may materialize in a similar way to what occurred after accession to the EPC. The remainder of this paper is organized as follows. Section 2 reviews the existing literature on the impact of patent strength and harmonization of patent systems on countries innovative activity and patenting. Section 3 describes the data used in our analysis. Section 4 discusses the changes in patent filing behavior brought about by accession to the EPC. Section 5 contains our descriptive analysis of patent filings and presents our results from an applicant-level analysis. Section 7 concludes. 8 In addition, a substantial share of the work burden associated with the filing and examination of patents is shifted from national offices to the European Patent Office (EPO), which may have implications for patent prosecution, such as examination practices, the speed of examination and hence backlogs. This may also have implications for national patent office budgets, due to the change in both fee levels and their allocation between national offices and the EPO -- although this is an aspect of accession that we do not investigate here. 9 The regulations of the unitary patent were created in December For more details see 3

4 2. Literature Bilir et al. (2011) look directly at the impact of the internationalization of the patent system by joining the Paris Convention. 10 They study the impact of the U.S. acceding to the Paris Convention in 1887 on patent filings by foreign nationals in the U.S. Using a sample of patents filed with the U.S. Patent and Trademark Office (USPTO) between 1865 and 1914, the authors find a strong positive impact following the accession of the U.S. on patent filings by inventors from countries that were already members of the Paris Convention prior to the U.S. relative to inventors from countries that joined later. The positive effect is more pronounced for countries with high pre-treaty levels of GDP per capita and education (measured as primary schooling), suggesting that countries with higher levels of economic development respond more strongly to the international strengthening and harmonization of patent rights. McCalman (2001) looks at the impact of the harmonization of intellectual property systems induced by TRIPS. He projects that there will be substantial income transfers resulting from harmonization, mostly from developing to developed countries. However, the analysis disregards the role played by multinationals and international trade in patented inventions. It is specifically this aspect that Branstetter et al. (2006) examine to find that a strengthening of intellectual property protection in 16 countries during the period had a positive impact on technology transfer within U.S. multinationals. Technology transfer is measured by the amount of royalty payments made by the U.S.-based company to its affiliates abroad for the use or sale of intangible assets. They also find affiliates R&D expenditure to have increased as well as their number of patent applications, where this effect is strongest for affiliate firms that have highly patent-active parent companies in the U.S. The analysis by Branstetter et al. (2006) is part of a broader, related literature that analyzes the impact of patent strength on innovation. Most of the empirical studies in this literature rely on aggregate country-level data to explore correlations between some measure of the strength of intellectual property rights protection, economic growth and innovation. For example, Gould and Gruben (1996) find a positive association between an index of patent protection and growth of GDP at the country level (for ). Kanwar and Evenson (2003) look more directly at the relationship between IP protection and innovation. They find a strong positive correlation between the strength of patent protection and innovation measured as R&D intensity for a sample of 29 countries over the period Similar evidence supporting a positive relationship between intellectual property protection and innovation is provided by Chen and Puttitanum (2005) for a sample of 64 developing countries ( ) measuring innovation as patenting. A key problem in this empirical analysis is the endogeneity inherent in a country s strength of patent protection; countries with superior innovative performance are more likely to choose strong patent protection. 11 Sakakibara and Branstetter (2001) address this problem by 10 The Paris Convention harmonizes national patent systems by providing national treatment and the socalled priority right. In particular the priority right facilitates the filing of patents in different jurisdictions as it allows applicants to preserve the first filing date in any of the signatory states as the patent s priority date within 12 months from the first filing. 11 For example, Ginarte and Park (1997) find that countries characterized by higher R&D levels, market freedom, and openness tend to have stronger patent protection. Moreover, the results suggest that there is a critical size of a country s R&D activity that drives countries to adopt stronger patent protection. 4

5 exploiting an exogenous change in the patent law in Japan in 1988, which extended the scope of patents mainly by allowing applicants to include several independent claims in a single patent specification. Their firm-level analysis shows no discernible impact of stronger patent rights on firms R&D investment or patenting. Similarly, Scherer and Weisburst (1995) exploit a change in patent law in Italy in 1982 that allowed patentability of pharmaceutical compounds. The authors treat the law change as exogenous because it was mandated by the Italian Supreme Court rather than the direct outcome of lobbying by pharmaceutical companies. Their analysis, which is based only on aggregate industry-level data, suggests no statistically significant impact on R&D spending although there was an increase on patenting by domestic companies in the U.S. following the law change. The authors interpret this as indicative of a change in patenting propensity, i.e., firms patented more for a given amount of R&D investment. 12 This short review of the existing literature shows that the evidence on the internationalization of the patent system is very limited. The only existing studies focus on relatively broad international agreements that only affected certain aspects of national patent systems but which did not produce a system that allowed obtaining a patent grant simultaneously in multiple jurisdictions The impact of accession to the EPC The key feature of the EPC is the harmonization and standardization of the granting procedure of patents in all member and extension states. Patent applications are filed with a single office, the EPO, which examines and grants the patent. Nevertheless, patentees are required to validate the granted patent in each national office of each country in which the patent should be enforceable. Validation in a national office requires prior designation during the grant process. Once granted, it requires the payment of validation fees as well as translation costs, although exceptions apply for contracting states to the London Agreement. 14 The national character of patents implies that they have to be kept in force in each individual country by paying renewal fees. Hence, turning an EPO patent into nationally enforceable rights requires: a. all the costs associated with the grant of an EPO patent (application fee, European search fee, examination fee, grant fee, and EPO renewal fees beginning the 3 rd year from the date of filing); Lerner (2002) looks at changes in the presence and strength of patent protection in 60 countries over a period of 150 years ( ) to find a country s GDP to be positively correlated with having a patent system in place. He also finds civil law as well as democratic countries to be more likely to have a (stronger) patent system. 12 See also Moser (2005) and Lerner (2002) for evidence based on 19 th century patenting. 13 Note that there is no research on the impact of joining the Patent Cooperation Treaty (PCT), which represents another important international treaty that harmonizes procedures to obtain patent protection. The PCT, which was signed in 1970, provides a uniform filing procedure for patents in all 148 contracting states (as of July 2014). While the PCT system unifies at an international level the filing of patents and the provision or search reports, the examination of patents is still done by the designated national offices. In this sense, the EPC system provides a much more harmonized patent system than the PCT. 14 Since May 2008, Germany, France, Liechtenstein, Luxembourg, Monaco, Switzerland and the UK do not require an EPO patent to be translated into their national language (it nevertheless has to be in one of the three official EPO languages). 5

6 b. the specific costs incurred for obtaining national patent rights (designation fee, translation fees, and validation fees). These account for the main difference between obtaining a patent right in a given member/extension state of the EPC through the EPO or directly with the national office. An additional difference arises from potential cost differences between employing the services of a European patent attorney and a national/local patent attorney. To obtain an EPO patent, fees payable to the EPO beginning the third year counting from the application date until grant of a European patent that designates two EPC countries amount to about EUR 4, To file with the EPO, domestic applicants in our set of accession states also need to translate their patent specification into one of the three official languages of the EPO, which is likely to be costly. Before 1 April 2009, which is the relevant period for our analysis, designation fees per designated country amounted to EUR 90 and are capped at EUR 630, i.e., there is no additional cost to designating more than seven countries. Validation fees at national offices vary across offices. While for example Norway and Slovenia do not charge validation fees, they amount to nearly EUR 170 in Turkey. Table A-1 in the Appendix summarizes the different applicable validation fees. Apart from designation and validation fees, to validate an EPO patent nationally, applicants may also incur additional expenses due to translation requirements. 16 In contrast, obtaining a patent directly with a national office is considerably cheaper than the EPO route. Similar to validation fees, the costs differ considerably across national patent offices. For example, national fees amount to approximately EUR 220 in Lithuania and to over EUR 900 in Norway. While national renewal fees are incurred irrespective of the route taken, Harhoff et al. (2009) suggest that their level still impacts on a patentee s choice of whether to validate a given EPO patent in a designated state. This means that the level of renewal fees may still impact on the choice of countries in which a patent is obtained, whether it is through the national office or the EPO route. Nevertheless, for a specific country the renewal fees are irrelevant for the choice between filing with the national office and the EPO since the same fees incur in both cases. Table 1 summarizes the different choices that resident and non-resident patentees can make. Before accession the choice is between filing a national patent and filing an EPO patent abroad. Post-accession, the choice set grows. Now applicants have the additional option of obtaining an EPO patent in the accession country instead of a national filing. 15 As of April 2010 (EPO Supplement 1 to Official Journal 3, 2010), the total cost can be computed as follows: application fee EUR 105 (filed online); European search fee EUR 1,105; examination fee EUR 1,480; grant fee EUR 830; renewal fees for 3 rd and 4 th year from the date of filing: EUR 420 and EUR In the countries signatory to the London Agreement, foreign applicants only need a translation of the claims of their EPO patent into the local language in order to validate the patent in the country. Among our set of countries, translation of the complete patent specification is still required by Bulgaria, the Czech Republic, Estonia, Norway, Poland, Romania, Slovakia, and Turkey. 6

7 Table 1: Impact of accession to the EPC Before accession After accession National EPO National EPO Home Abroad Home Abroad Yes Yes Yes No Yes No Yes No Yes Yes No No Yes Yes No Yes No No No No No No No In our analysis in Section 5, we are interested in estimating the impact of accession on the patenting behavior of both domestic and foreign companies. The discussion above suggests that any effect of accession to the EPC should come mainly from a shift in costs (including costs associated with the difficulty of having to file in a foreign country) associated with obtaining a patent in a given country. To illustrate this slightly more formally, let the incremental value of a patent in each European country be denoted V i and the cost of patenting be denoted C i with countries denoted i = 0,1,,J. The value and cost of domestic patenting are V 0 and C 0. A firm will take out a patent in every country where V i - C i > 0, with one complication due to the fact that the EPO is cheaper after a certain point. Assume that V 0 - C 0 is larger than all the others. That is, if a domestic firm patents at all, it patents in its home country (which is supported by our data as shown in Section 5.1 below). We disregard maintenance fees in our analysis because they are the same regardless of the route through which patent protection is obtained. We also disregard any differences in legal fees across the two patenting strategies. 17 Before accession to the EPC, firms make the following computation when they decide whether to patent domestically: V 0 C0 0 (1) In contrast, their decision to obtain an EPO patent or instead to patent directly with the individual national patent offices is determined by the following condition (assuming that J ( V i Ci) 0 ): i J V C ( V C ) (2) i EPO i i i 1 i 1 Which is to say that firms choose the EPO route if the net value of taking out a patent with the EPO exceeds the sum of the net values of obtaining patent rights with the individual offices. After accession, expression (2) changes into J 17 Alternatively, we could include the legal fees in the cost variable, which would mean that we can no longer use the patent office fee schedules to calibrate it. It is likely that legal fees for applying at the EPO exceed those for domestic offices. However, if an applicant wants to pursue applications at several national offices, legal and translation fees could be substantial. 7

8 J V V C V C ( V C ) 0 i EPO 0 0 i i i 1 i 1 or C C C 0 0 J i i EPO J (3) If the value of a patent and fees stays the same after accession, then the effect of accession works exclusively through C 0, that is, for sufficiently large costs at the domestic patent office, firms choose an EPO patent over several national patents including a patent with their domestic patent office. Then the main question is for which number J, expressions (2) and (4) hold. If for illustration we assume that the threshold is J 3, this means that for J=1 or 2, domestic firms only wanted to patent in one or two countries in addition to their own before accession. After accession, domestic patenting enters the set J, which means that patentees that were formerly patenting in only J=2 countries, find themselves at the threshold level J 3 after accession. This in turn means that expression (3) holds and these firms will choose an EPO patent instead of patenting separately at each national patent office. Hence, our simple analysis implies that for J=1 and domestic patenting before accession, EPO accession will not affect domestic firms patenting strategies for most inventions. That is, if firms only wanted to patent in one or two countries in addition to their own before accession, accession does not change this. 4. Data We analyze the impact of accession to the EPC for the 14 contracting states shown in Table 2 where EU members are shaded in grey (see also Appendix Tables A-1 and A-2): 18 Table 2: Accession states and dates Country EPC Extension Date EPC Accession Date EU Accession Year Bulgaria 1/7/ Czech Republic 1/7/ Estonia 1/7/ Croatia 1/4/2004 1/1/2008 Hungary 1/1/ Lithuania 5/7/1994 1/12/ Latvia 1/5/1995 1/7/ Iceland 1/11/2004 Norway 1/1/2008 Poland 1/3/ Romania 15/10/1996 1/3/ Slovenia 1/3/1994 1/12/ Slovakia 1/7/ Turkey 1/11/2000 Note: grey shaded areas indicate country is European Union (EU) member 18 Due to a lack of sufficient data, the following contracting states are excluded from the analysis: Albania, Former Yugoslav Republic of Macedonia, Serbia, Montenegro, and San Marino. 8

9 As shown in Table 2, all accession states that also became part of the European Union (EU) joined the EPC before officially becoming a member of the EU (except for Latvia). 19 The set of countries covered by our analysis is heterogeneous. It includes a large number of former Eastern bloc countries, the Scandinavian countries Iceland and Norway, as well as the large transition economy Turkey. As noted earlier, these countries generally have lower GDP per capita than the EPC founding states, with the exception of Iceland and Norway. The patent data for the analysis presented in Section 5 come from EPO s Patstat database (version April 2014). We extracted patents filed with national patent offices, at the EPO and via the PCT route at WIPO. Our analysis focuses on patents filed by residents of the countries listed above and residents of other countries (referred to as non-residents in the analysis) with the national office as well as the EPO (and WIPO). Appendix A1 explains how we identify EPO patents that have been validated in an accession state. 5. Aggregate analysis 5.1 National office filings We first show that there have been large changes in aggregate patent filings following accession to the EPC. In Figure 1, we compare filings by residents and non-residents with the national offices. 20 The figure shows an (expected) dramatic effect of accession to the EPC on filings by non-resident applicants at the national offices. Non-residents filings drop between the preaccession and post-accession quarters by over 90% from about 6,000 to fewer than 500 applications. More surprisingly, resident filings, in contrast, seem to be largely unaffected. Hence, Figure 1 indicates that total non-resident filings decline sharply on the date of accession and fall further over time whereas resident filings remain largely unchanged. 19 Members of the EU have to be signatories of the EPC, but not vice versa. 20 We have fairly complete patent data on applications up to the last quarter of 2011, which means that we have at least 12 quarters of post-accession patent data for all countries. This ensures that changes in the number of patent filings are not driven by entry and exit of countries into the sample. In order to visualize any potential changes following accession, in much of what follows we rescale the time period for all countries (the quarter of the accession date is time zero). The regressions presented later in the paper control for the fact that there are also underlying trends in patent application using quarter-year dummies. 9

10 Figure 1: Patent filings at national office by non-residents and residents (by quarter) 1. Patent filings at national offices before and after accession Quarters since accession By non-residents By residents Note: time represents the application date of a patent. Number of patent filings by country have been corrected for equivalents. 5.2 EPO filings The theoretical arguments above suggest that the non-response of residents to EPC accession could be because they only wish to patent in one or two countries, and there is no cost advantage from switching to EPO patent filing. We examined this hypothesis by looking at the distribution of patent family filings (equivalents for the same invention, defined as patent applications that share a priority patent) across the three choices: (a) EPO only, (b) national office only and (c) both the EPO and the national office. This distribution is shown in Figure 2, by quarters before and after accession to the EPC. There is a complication due to the fact that patent filings at the EPO and the national office usually take place 3 to 4 quarters apart. For this reason, we show two versions of the figure: one based on application date, where each filing that occurs both at the EPO and the national office is counted twice (hence the relatively large size of the central band) and one based on priority date, where each unique priority is counted only once, and the dating is relative to the priority date. The figures show similar things: first, the vast majority of patent filings by residents of accession countries are at their national offices and this remains true after accession. Second, there is a doubling of EPO filings after accession, but from a very small base (from about 50 per quarter to 100 per quarter). Finally, and somewhat puzzling, the share of patents filed at both the EPO and the relevant national office is largely unchanged by accession, in spite of the fact that this strategy would appear to be more expensive than simply filing at the EPO and designating one s own country among others. 10

11 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% Figure 2: Patent filings by residents of accesion countries by quarter before and after accession Patent filings by residents of accession countries - by appln. date 0% National office only Both EPO and national office EPO only 100% Patent filings by residents of accession countries - by priority date 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% National office only Both EPO and national office EPO only At the time of filing, applicants to the EPO can designate the member states for which they desire patent coverage, paying a nominal fee (~100 euros) for each, up to a maximum of 7, after which the subsequent states are free. In practice, the majority of EPO applicants designate all 38 member states. However, after grant they can choose whether or not to validate the patent in these member states, and again, in practice, applicants validate in very few countries. Table 3 investigates this behavior for accession country resident filings to the EPO and finds that they behave in a similar way and that this behavior is not changed very much by accession to the EPO. Both before and after, more than 90 per cent of the applications designate 7 or more states, whereas they are less likely to validate in that many states. The median number of designated states is 12, whereas the median number of validated states is 3. 11

12 Table 3 Patent counts for member states designated and validated for EPO patent filings by residents of accession countries Where patent was filed EPO, also at national offices EPO filing only Number of designated states at EPO Before accession After accession Before accession After accession More than 7 1,416 1, ,362 Total 1,523 1, ,459 Granted patents only Number of validated states at EPO Before accession After accession Before accession After accession Zero More than Total nonzero Before is defined as 12 quarters prior to the accession date and after as the accession quarter plus the 11 quarters following. Unit of observation is an EP patent application by an accession country resident. The fact that accession country residents hardly change their filing strategies after accession is puzzling, because it would presumably become much cheaper to simply validate an EPO patent in their own country. Clearly they are designating a large number of states (including their own) so it would be feasible. There are several possible explanations for this fact, which has also been observed in at least some of the older EPC member states: 1. The applicant may wish to obtain a search report cheaply from his national office before pursuing an international application. In this case, we would not expect to see a grant of the patent, as the applicant is likely to withdraw the application before grant The applicant could have different expectations of granting probability, and seek to maximize the chance that he receives at least one patent grant. 3. The applicant may wish to create the maximum amount of uncertainty about the extent of his intellectual property rights for his competitors. 4. The actual claims on the applications may differ, in spite of the fact that the applications claim the same priority patent application. 21 We are grateful to Roger Burt for suggesting this possibility. 12

13 Explanation (1) is somewhat difficult to assess because of grant lags. But there is some support for it if we restrict analysis to accession countries prior to 2008 (excluding Norway and Croatia). During the 12 quarters prior to accession, about 80 percent of the patents with equivalents at both offices were granted before 2013, whereas after accession, only 47 per cent were granted during the first 12 quarters following. We also examined the cases where an accession country resident applied for a patent on the same invention at both the national office and the EPO after accession. In almost all cases, the priority patent was the national office patent, as suggested by (1) above. However, in about a quarter of the cases where we observed either a grant at the national office or a validation in the accession country after an EPO grant or both, the patent did appear to be pursued until grant and validation at both offices. The mean lag between the national grant and the subsequent EPO grant is about 2 years, and a significant number have a lag longer than 5 years. Because the national patent lapses if an equivalent EPO patent is validated in the country, this suggests that one reason for the dual approach may be the earlier coverage that is obtained with the national patent. Regardless of the reasons behind these findings, the effect is to increase the complexity of the patent landscape facing other firms. Figures 3 and 4 look at the filing behavior of residents and non-residents with the EPO. As discussed earlier, when a patent is filed at the EPO, the applicant designates the list of member states (countries) in which the patent may potentially be validated, and then after grant, may or may not validate the patent in each of those states. This means that we can only establish whether a patent has been validated in a given EPC member state once the patent has been granted, so for this analysis we restrict the sample of patent filings with the EPO to patents that have been granted. A second complication is that both residents and non-residents validate in a range of accession countries, and because accession dates vary, it is not possible to generate a figure for non-residents exactly parallel to Figure 1 for residents. Our approach is twofold: first the aggregate EPO filings, designations, and validations are presented for residents and nonresidents, with multiple counting when a filing designates more than one accession country. Then we look at each accession country separately, which eliminates the accession date timing problem. Figure 3 shows that EPO filings by accession country residents do rise slightly after accession, and that the vast majority of these designate the accession country at the time of filing. About half of these filings are granted by the end of 2013, and the share of the grants validated in the accession country is increasing. However, a fair number of these granted EPO patents are not validated in their own country (slightly less than half). In contrast, Figure 4 shows similar data for non-residents. This figure shows the sum of designation and validation behavior over the 14 accession countries, which means that each EPO patent filing is counted up to 14 times so that the counts are comparable to the designation and validation counts (because non-residents are equally likely to designate and validate any or all of the accession countries). From the figure, one can see that non-residents of the accession countries are less likely than residents to designate these countries when they apply for an EPO patent, and are also much less likely to validate a granted patent in all the accession countries. 13

14 Figure 3: EPO patent filings by residents (by quarter) 3. EPO filings by accession country residents Quarters since accession EPO Filings EPO patent granted Designated accession country Validated in accession country Figure 4: EPO patent filings by non-residents (by quarter) 5. EPO filings by accession country non-residents Quarters since accession EPO patent filing EPO patent granted Designated accession country Validated in accession country Note: time is the application quarter of an EP patent relative to the accession date of the relevant country. Table A-4 in the appendix summarizes these data for the quarters after accession. Most accession countries are designated on about 65-70% of the EPO patent filings, with the exception of Norway, which is designated 96 per cent of the time. Given a grant and designation, 14

15 the EPO patents are validated about half the time in Norway and Croatia and 40 per cent of the time in Hungary; for the other countries, validation never rises above about a quarter. 22 The results of this aggregate analysis are clear: accession to the EPC has almost no impact on patenting by residents of the accession countries, whereas non-residents immediately switch (almost) all their applications to the EPO, as one would have expected. We evaluate this result more carefully using simple regression analysis of aggregate patent applications in Table 4, 23 where we have included calendar quarter dummies to adjust for the fact that overall patenting is changing during this period, and a trend post-accession to allow for slow adjustment to the change in regime. The results here are slightly more nuanced: as before, non-resident applications to national offices collapse immediately (the coefficient of corresponds to an 80 per cent decline in applications). Residents also reduce their applications at the national offices but by a much lower percentage. The most interesting result is the significant growth rate of EPO applications by accession country residents post-accession, even though the initial first period impact is nil and the level of patenting very low. Table 4 Predicting aggregate patent applications Dependent variable: log (patent applications in the quarter) 952 obs = 14 countries x 68 quarters Resident EPO applications by applications at residents national offices Our findings suggest that the impact on innovation by residents of accession countries may be quite muted, and also that there may be considerable inertia in their patenting strategies. Because EPO patenting rises so slowly, there is a good reason to think that access to markets outside the country is not severely limited by access to patent protection. This conclusion must be tempered by the observation that patenting at the EPO is still considerably more costly than simply patenting at the national office. Apparently the prospect of greater market penetration on the basis of patent protection is not sufficient to overcome the cost differential. 22 Note, however, that Norway and Croatia are the most recent entrants to the EPC and have correspondingly lower grant percentages, due to the grant lag at the EPO. It may be that applicants in these countries are more likely to validate patents that are granted quickly. 23 Note that the table excludes non-resident applications at the EPO because the relevant variable are EPO applications that are eventually validated in an accession country; however, this requires to focus on applications that have been granted because validations only occur after grant. Hence, we would have to focus on EPO applications by non-residents that were granted which is not comparable with the application counts used for the results presented in Table Non-resident applications at national offices Post-accession dummy (0.13) (0.10) (0.29) Post-accession trend (0.013) (0.030) (0.037) Country dummies yes yes yes Quarter-year dummies yes yes yes Standard error Adjusted R-squared Durbin-Watson Standard errors are robust and clustered on country.

16 5.3 Mechanisms Next we analyze the mechanisms that have lead to the two main findings of Sections 5.1. and 5.2: a) Resident applicants hardly respond to accession; applications by residents with national offices are largely unaffected; there is significant uptake of EPO filings by residents that are validated in a resident s home country. b) Non-resident applicants respond strongly to accession; they drastically reduce their filings with national offices; they validate a large number of EPO patents in accession countries. Our interest here is in applicant behavior, we ask whether resident/non-resident applicants change their patenting behavior and whether the set of resident/non-resident applicants changes following accession. Hence, we ask whether the effects are driven by (the lack of) adjustments at the intensive (number of filings per applicant) and extensive (number of applicants) margin of patent filings. Table 5 shows aggregate figures for different applicant types where we classify applicants into types according to their filing behavior as laid out in Table 1. At the aggregate level, we can check whether the total number of applicants has changes following accession and whether there has been change in the number of applicants across applicant types. This provides a coarse way of verifying whether there have been any changes at the extensive margin. Further, we can check whether the total number of patent filings has changed and their distribution across applicant types. 16

17 Applicant type Applicant type Table 5 [placeholder numbers have to updated] Applicant and filing counts before and after accession Residents Before accession After accession National EPO # Applicants National EPO # Applicants Home Abroad Home Abroad ,275 6,553 10,546 6,659 Total 10, ,840 10, ,886 Non-residents Before accession After accession National EPO # Applicants National EPO # Applicants Home Abroad Home Abroad 32,292 90,665 4,604 1,175 5, ,434 66,404 40, ,335 18, ,672 53,321 6,656 4,098 2,529 1,882 Total 38, ,099 75,106 3,704 40, ,908 74,321 In order to isolate the impact of accession to the EPC on applicants patent filing behavior from confounding factors such as broader economic reforms, EU accession, and unobserved heterogeneity more broadly, we estimate the following equation: Number of applications per applicants on stuff Number of applicants on stuff To identify the accession effect, we rely on the staggered timing of accession, i.e., we exploit the fact that countries joined the EPC at different points in time (see Table 2). Hence, an estimate of the impact of joining the regional system is obtained from comparing patent and applicant counts before and after accession in a given country relative to the change observed during the same period of time in another country that is not joining the EPC at the same time. 24 An important assumption underlying this approach is the exogeneity of the decision to join the EPC and the timing of accession with respect to firms patenting activities. The descriptive evidence on resident and non-resident applicants filing behavior presented above, reassuringly showed little evidence for accession to have occurred during a general upward or downward trend in patent filing by residents of the accession countries. 24 This identification strategy is similar to Acharya et al. (2010) and Png (2011). 17

18 We are interested in a) domestic firms decisions to file for domestic or EPO patents and therefore focus in our empirical analysis the firms choice set to these two alternatives. In order to test this prediction empirically, we do two things: first we estimate standard patent production functions in which we estimate the impact of accession on total filings, filings with the domestic office and filings with the EPO; second, we estimate a bivariate probit model that focuses on firms choice of whether to patent with the domestic office and/or the EPO and allows for the choices to be interdependent. First we estimate a standard patent production function where the coefficient of interest is obtained from the following (quasi-)differences-in-differences specification of a Poisson regression: p ~ f ( accession X ) (4) ict i t ct ict where i = 1,, N, time t = 1,, T, and country c = 1,, C. In Equation (4), p ict denotes the number of patents that firm i in country c in year t applies for a domestic patent and/or an EPO patent. Accession ct = 1 after a country acceded to the EPC and zero otherwise. The impact of accession is therefore captured by the coefficient γ. α i is an applicant-level fixed effect, δ t a timetrend that absorbs common time-specific shocks, and X ict denotes a vector of time-varying applicant-level characteristics. We only have a limited number of such time-varying firm-level variables namely the applicant s total patent stock and age (measured as counting from the year an applicant is observed to patent for the first time). 25 Standard errors are clustered at the applicant level. In addition, we estimate a bivariate probit model for the firm-level decision to apply for at least one patent at the EPO and/or the national office. This model allows the two decisions to be correlated conditional on the same regressor variables as in equation (4) time, accession, and employees, assets, and the subsidiary dummy. 6. Conclusion What is the impact of accession to the regional patent system created by the European Patent Convention? Despite the substantial enlargement of the group of states signatory to the EPC, so far there is no evidence on the impact of accession on the acceding states. This paper represents a first step towards filling this gap. Our analysis of aggregate patent filings suggests that following accession: (a) non-residents drastically reduce their filings with the national office immediately upon accession, (b) this drop is largely due to chemical and pharmaceutical patents, (c) residents filing behavior appears to be largely unaffected in the aggregate and also across technology classes, (d) the number of EPO patents designating an accession state jump up immediately following accession, although the 25 Total assets are deflated using a country-level GDP deflator provided by the UN Common database. 18

19 number of EPO patents that are indeed eventually validated after grant is substantially lower; (f) a firm-level analysis for the manufacturing sector in 13 accession countries suggests no statistically significant impact of accession on filings with the domestic patent offices by companies registered in accession states, but a positive and statistically significant effect on EPO filings. We are currently exploring whether the firm-level effects are due to foreign-owned or domestic firms, given the earlier results for residents and non-residents which suggested no impact on domestic firms. 19

20 References Acharya Viral V., Ramin P. Baghai, and Krishnamurthy V. Subramanian (2010): Wrongful Discharge Laws and Innovation, mimeo. Bilir K., P. Moser, and I. Talis (2011): Do Treates Encourage Knowledge Transfer? Evidence from the Paris Convention, Available at SSRN: Branstetter L., R. Fisman, and F. Foley (2006): Do Stronger Intellectual property Rights Increase International Technology Transfer? Empirical Evidence From U.S. Firm-Level Panel Data, Quarterly Journal of Economics, Vol. 121, pp Chen Y. and T. Puttitanum (2005): Intellectual Property Rights and Innovation in Developing Countries, Journal of Development Economics, Vol. 78, pp Diwan I. and D. Rodrik (1991): Patents, appropriate technology, and North-South trade, Journal of International Economics, Vol. 30, pp Fink C., M. Khan, and H. Zhou. (2010): The surge in worldwide patent applications, presentations to the Third Annual Patent Analysis Workshop, IPTS, Seville, Spain, June Ginarte J. C. and W. G. Park (1997): Determinants of patent rights: A cross-national study, Research Policy, Vol. 26, pp Gould D. M. and W. C. Gruben (1996): The role of intellectual property rights in economic growth, Journal of Development Economics, Vol. 48, pp Hall B., C. Helmers, V. Sena (2013): The importance (or not) of patents to UK firms, Oxford Economic Papers, Vol. 65(3), pp Harhoff, D., K. Hoisl, B. Reichl, and B. van Pottelsberghe (2009): Patent Validation at the Country Level the Role of Fees and Translation Costs, Research Policy, 38, pp Helpman, E. (1993): Innovation, Imitation, and Intellectual Property Rights, Econometrica, Vol. 61, pp Heston, Alan, Robert Summers and Bettina Aten (2012): Penn World Table Version 7.1, Center for International Comparisons of Production, Income and Prices at the University of Pennsylvania, downloaded on 30 July Kanwar S. and R. Evenson (2003): Does Intellectual Property Protection Spur Technological Change?, Oxford Economic Papers, Vol. 55, pp Lerner J. (2002): 150 Years of Patent Protection, American Economic Review, Vol. 92, pp McCalman P. (2001): Reaping what you sow: an empirical analysis of international patent harmonization, Journal of International Economics, Vol. 55, pp Moser, P. (2005): How Do Patent Laws Influence Innovation? Evidence from Nineteenth- Century World s Fairs, American Economic Review, Vol. 95(4), pp

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